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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ced55696cc6bec3bcd2a5955f32e8174138cd739f223e504e3413c92ff363f' 
  AND token = 'jt/k4mV2wlCVKHN6bMCe37FCX3icHhBPLH7iExl6gVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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