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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a6b0a882c982d01191ddb7fbb581fe0988a2c08fe539afd4b4425e2580f8c8' 
  AND token = 'KFmeCbOAumXcDsge+DzpqyP4jnwOAo3t1MFu0wI87ss=' 
  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"
    }
  }
}