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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a22fcd31cbc8122b07c71ed1a90e68aa0a53261fa40596f4e265e4e7987a23' 
  AND token = 'Fv9tvXUfd2zMP82noasNX4y2aQ/zoL8GrJM97SjfFaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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