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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6f051a7279e0aec705d6d0352cfd01932b93ec5c1484010e53b2a5b6fbf002' 
  AND token = 'UBTN0dtr+8F1Roivr97ydeDbhYNktv+oH6osLlUdKiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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