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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e07170631c24233cc22eaa7282a85b52e855fac7434593db94e849c511a2bfe' 
  AND token = 'RJ2MerDTeH+Bk76egk97xDRFdN0LYEU6311fyzWfgDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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