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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8069a47b3274da429cb71e1723d96a83fc5b3741908f20cf902f15b5bedd76b3' 
  AND token = '68f3LaiXJ9miv8potHyZw/H2bJ23EXQivtIo0KEsY+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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