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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42a22ce34875b556fed5f84157fcb729c7d0de946ece6a08b13a9bbe5be8a2b7' 
  AND token = 'g5lVQ64TU6+ed/vZylYu9a98xF2KDiWa6LHghIfHIAk=' 
  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"
    }
  }
}