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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5855075aa3a184e9e8f0f11ff796ed49c42564443af5a4b780e1f30170e18a74' 
  AND token = 'AaMi1vTp3AIejjqpBUW37+7xevAta4s/7bT/KEAzX7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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