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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aadbb5fa96504341dd76f6b6cfd8c2c53702ea93381bf9e2befdef67cde384f' 
  AND token = 'DAytPlPu5O+RTnOprcrcsQODTBEScYXyFpQLfb8o4Vs=' 
  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"
    }
  }
}