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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8d67ce2fb5f6482938dd4013e9a0f3a437ee7d1c3810990e9613e2b652acaa' 
  AND token = 'ibS6nh6hQ0NBpi+QK5E8sfOaDixXfd9Jol5JE9BWvaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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