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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6889abe7f6721bdbf154068fa5579324b4632096b98d752368437447a6a93b3' 
  AND token = 'Dj+3mNSjm1uboYXXoc2oSgb+tb3Nk2vlgD47drKUEoo=' 
  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"
    }
  }
}