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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f517e69b1e9438994105058f60c0364a508d8fcee3c1a172250531b4d275b728' 
  AND token = 'e9xSv/XO6sRleAPa6zNqh1q+7EOvZhoTMkiFqosZt24=' 
  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"
    }
  }
}