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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ddc4890e160a8d0dd9d313df9eba3b2e24ce126727a4c26b8403a927bd3ff7' 
  AND token = 'eEjAi67vEomnNwDbHR5/LFpE4MzgVD3I6DCiGlvcR4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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