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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15f7ba7c4ceb80c74a90f136022a2bee348affe3531ce5f5130dcf78239b87f0' 
  AND token = 'l0QwdBU52xfHHNGGovAAoh4QAvisnC4Tnk0p7DP4BUU=' 
  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"
    }
  }
}