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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a41871936fba5df70f915b5a65cde00fb841fcacc2b13fb1b9bb8e9f4b8a2e83' 
  AND token = '/iCCf8ZZifywXR7CqccROszcZD7u1Fk1gj/Y0R7rOeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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