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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f73205efc4d613a220e8623d4692daaf22b2738afc6355abd34a94ae8193a77' 
  AND token = 'pR5lfPOV5R175tSRaiiPMA7OXomcF+oebDmXRKm2CVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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