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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed59cb50b697464f06201d0802199cb8ce90f62e693ec51f8f506988a6b6ff89' 
  AND token = 'p82zdLmm+S71s7mNRj5IgsoE46boENwRxfe9uRwvLqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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