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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7929b0dbaf47698c8df6c1c00a1ee0ae60ad06c38c076f5a1ae37723ff3ee5ab' 
  AND token = 'cNxgqL6XSK6s1N54xRix5SVPQlOeG1/98maMDFWlZqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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