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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77fbf29c65dc06be535f5a341b2e072aaa57a1f0e811852e1c3bc677b77f116b' 
  AND token = 'zKaupQddc0X1cmr9+Mw+2nvA7h/QcXSe6Qu+sCxqOPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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