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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3659b0f4b67467df87b5b03cce134ebd95537d2a7ee433b0a16a772d035a669' 
  AND token = 'OEs4jxWYZ9x9vLKH3olm+/1IiwysvS7oTtS5aRk4Wqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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