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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d9951950f6438df95797798fe07876af454ebed12c7f4503b1d16319879b0f' 
  AND token = 'oL4W0wylHZdS64WfCpPE4DEdFw19oh8oAePI+y+k2Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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