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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c924aa32aba934c16cb687c909a4858ef1f2b2f67d015e26ac418a7dc8b5d4c' 
  AND token = 'v612cx1az7pStImOT/bPaxAe6McEEEx4sk4QwzbW6hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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