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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd191f1ffc7668d3b14c8a766ab5b6a13f8f894e4eb86338f938e3ac332c7f3' 
  AND token = 'TIHf9J377uCZX33k/65884duG/JKSp+IcS+rYG9x61I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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