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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75db97b0aaabe1d9bedbcc49bd4b85bd39c685698cedfe30fb56dda31c9ee6dc' 
  AND token = 'fDUpJu1Z3AIFWNm75ATskFgt0ilmR/LZAphGQkpW6vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}