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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3849341ea7c8ab26f6b73905c23faf2b1d04f5c2e45ea462e7739f50bb27f1' 
  AND token = 'EyMXUV33+wVMB4s+CUkPwKIGb3ALC6zc/fBUeAcofjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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