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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8445370d3ba664ba5ea6c19a0ac6322bb1cc0b238e1d8a6945dfa5f5ec7097' 
  AND token = '7+3tq5wOBh+0i0WTKuI5QorfweacB7qXvRWgjgMhY8o=' 
  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"
    }
  }
}