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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a01ac020aca898f667fcb80686c4ee887cc2b6008a129e9794bea2639cd1c0' 
  AND token = 'nK0mI89U6Cr3yW9fDvfa0vJUkrn+/+DTWjTSRdX8VjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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