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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a42362fd70c2e9ac9ee02b4b17b8467caf88d403988eb468c67ce4691fac9dfb' 
  AND token = '0J20N4G2TKddLGElLpSHhOq341leLnYC3Zla41DXTzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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