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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca6f99a8f0a82c35eef1165694f7fb105e0452478083352a00accf4f98ca059' 
  AND token = 'VEPJxRPc5E3DEcyZchiG2A17BYBM165aWhEZ5cATNTo=' 
  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"
    }
  }
}