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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea4761783b3af1dfbe6b0ae204c16404650c92882feb6fc9b4034f977098d28' 
  AND token = '3NQgFzmCXo9qWFLlq35AU0F+mR8ToG24s31PIeQdL8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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