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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2667138621c53eaaddcc06fcda9e15e393478cae375b7edb15888e63282b7468' 
  AND token = 'WOtXgI6bZx1rTMGVQ87gQ9IMILIC2yuKtoQwSIkxFTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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