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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b6cfa7c5db13309394c32123982614f575c0da9959fa2a2f398d0daa60c7d01' 
  AND token = 'rEQn2X6p++gGMaCL7pGJcmM3/kl1ejl4611CUku5HhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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