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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b6239e1e48fbc7a7195f2acc0528c43e8f47821402898ec3afa16009165aa9' 
  AND token = 'eGrwAFvCaUbwP2zrMl1T9kGNfIDFGpgJ2uYo66lL5B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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