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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c346289312c315eb3e4e7e68b33d9f7d272d75001a2067f86fc69b5d1b3eeb3b' 
  AND token = 'Nl+R3chz7mCRXGBFKgT2YY2iW6iscHWMG+UBKyeG1Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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